• Ultraviolet Photography
  •  

Eichhornia crassipes (common water hyacinth)

Multispectral Fluorescence
5 replies to this topic

#1 Mark

    Member

  • Members(+)
  • 487 posts
  • Location: Massachusetts, USA

Posted 27 May 2019 - 20:00

Duda, M. (2019) Eichhornia crassipes (Mart.) Solms (Pontederiaceae) Common water hyacinth. Flower photographs of reflected ultraviolet, visible, ultraviolet induced visible fluorescence, infrared, ultraviolet induced infrared fluorescence, and cyan induced infrared fluorescence. (https://www.ultravio...water-hyacinth/)

Ipswich, Massachusetts, USA
42°43'32.1"N 70°52'55.6"W
2019.May.26
Greenhouse cultivated

Pollinators:  Long-tongued bees.

Comment:  This specimen was transported from a greenhouse to the studio for photography.  The flowers were completely wilted within several hours after capturing the following photos.

References:
1.  Native Plant Trust (2019) Eichhornia crassipes (Mart.) Solms-Laubach:
https://gobotany.nat...rnia/crassipes/

2.  Wikipedia (2019.May.22, 14:57 UTC) Eichhornia crassipes:
https://en.wikipedia...ornia_crassipes

Equipment:
Nikon D750 (modified) + Nikon 50 mm Series E + 12 mm extension tube
Illuminant/excitation/barriers vary as listed below

Visible:  f/11, 1/2'', ISO200; EF-500 DG flash source; S8612 + 420 nm long pass lens filters
Attached Image: 2019-05-26_11-36-27_flash--s8612-420lp.jpg

Ultraviolet:  f/11, 4'', ISO200; MTE-U303 source + U340 filter; Asahi 0340 lens filter
Attached Image: 2019-05-26_11-34-45_mte-u340--0340.jpg

Ultraviolet induced visible fluorescence:  f/11, 15'', ISO200; MTE-U303 source + U340 filter; Baader UV/IR cut + KV418 lens filters
Attached Image: 2019-05-26_11-37-36_mte-u340--baader-kv418.jpg

Infrared:  f/11, 1/2'', ISO200; 40W clear glass incandescent bulb source; R72 lens filter
Attached Image: 2019-05-26_11-40-40_incan--r72.jpg

Ultraviolet induced infrared fluorescence:  f/11, 25'', ISO200; S2+ source + U340 + KVHM filters; R72 lens filter
Attached Image: 2019-05-26_11-42-51_s2-u340-kvhm--r72.jpg

Cyan induced infrared fluorescence:  f/11, 30'', ISO320; Cyan LED source + BG39 filter, R72 lens filter
Attached Image: 2019-05-26_11-45-35_cyanled-bg39--r72.jpg

Edited by Mark, 01 June 2019 - 13:46.


#2 nfoto

    Former Fierce Bear of the North

  • Owner-Administrator
  • 2,267 posts
  • Location: Sørumsand, Norway

Posted 27 May 2019 - 21:37

These images are so strikingly pretty one tends to forgive E. crassipes of being such a troublesome aquatic plant ! Excellent documentation of its hidden features.

#3 dabateman

    Da Bateman

  • Members(+)
  • 691 posts
  • Location: Maryland

Posted 28 May 2019 - 12:03

Thats the best UV induced visible fluorescence I have seen. Outstanding work and images Mark. The uv induced IR also looks better than the cyan.
Very interesting.

#4 Andy Perrin

    Member

  • Members(+)
  • 2,009 posts
  • Location: United States

Posted 28 May 2019 - 15:45

The backlighting looks nifty!

#5 Mark

    Member

  • Members(+)
  • 487 posts
  • Location: Massachusetts, USA

Posted 28 May 2019 - 22:12

@Andy: I didn't actually employ any backlighting in this set. Or perhaps you're referring to the translucence of the petals where some of the fluorescence is shining through from within? (which I happen to like very much)

@dabateman: Qualitatively I'm not sure if I have an aesthetic preference for either the UVIIF or CyIIF (each has it's pro's/con's IMO) - but what I do find very interesting is how the longer cyan wavelength lights up that spot in the middle of the central petal, while the same spot does nothing (re: fluorescence) under UV!

#6 Andy Perrin

    Member

  • Members(+)
  • 2,009 posts
  • Location: United States

Posted 28 May 2019 - 23:56

Mark: the latter.